1. Rdson and Current Rating The SQM100N04 is rated for 100A (2.7mΩ @ 30A), while the IRL1404 is rated for 75A (3.1mΩ @ 75A). The former has a higher current rating, but its Rdson is specified at a lower test current. The actual conduction loss under high current must be evaluated using the output characteristic curves; superiority cannot be judged by the Rdson value alone. 2. Switching Performance and Drive Requirements The IRL1404's Qg (110nC @ 5V) is significantly lower than the SQM100N04's (145nC @ 10V), and its Ciss is smaller. At the same drive voltage, the IRL1404 switches faster, incurs lower switching losses, and places less demand on the gate drive current. The SQM100N04 requires a more robust gate driver to achieve its full performance. 3. Thermal Design Margin The IRL1404 is rated for a Pd of 230W, compared to 157W for the SQM100N04. This suggests that, under identical package and test conditions, the IRL1404 likely has a lower thermal resistance or a more conservative rating, potentially offering a greater thermal safety margin in high-power dissipation applications. 4. Reliability and Application Grade The SQM100N04 carries AEC-Q101 certification and an Automotive grade. Its design, manufacturing, and testing standards target high-reliability scenarios like automotive electronics. It typically outperforms non-qualified commercial-grade parts (like the IRL1404) in long-term reliability metrics such as temperature cycling and biased life testing. 5. Cost and Cost-Effectiveness The SQM100N04 is approximately 84% more expensive. This premium primarily reflects the added reliability costs of its automotive-grade certification and potentially stricter process controls. In industrial or consumer applications without stringent reliability requirements, this premium may not yield significant performance benefits.